pyrochroite

pyrochroite

[‚pī·rə′krō‚īt]
(mineralogy)
Mn(OH)2 A hexagonal mineral composed of naturally occurring manganese hydroxide; it is white when fresh, but darkens upon exposure.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Supersaturated minerals Mineral phase Mineral formula Albite NaAl[Si.sub.3][O.sub.8] Anhydrite CaS[O.sub.4] Anorthite Ca[Al.sub.2][Si.sub.2][O.sub.8] Barite BaS[O.sub.4] Ca-Montmorillonite [Ca.sub.0.165][Al.sub.2.33] [Si.sub.3.67][O.sub.10] [(OH).sub.2] Celestite SrS[O.sub.4] Chlorite (14A) [Mg.sub.5][Al.sub.2][Si.sub.3] [O.sub.10][(OH).sub.8] Chrysotile [Mg.sub.3][Si.sub.2][O.sub.5] [(OH).sub.4] Gypsum CaS[O.sub.4]:2[H.sub.2]O Hausmannite [Mn.sub.3][O.sub.4] Pyrochroite Mn[(OH).sub.2] Sepiolite [Mg.sub.2][Si.sub.3][O.sub.75] OH:3[H.sub.2]O Sepiolite(d) [Mg.sub.2][Si.sub.3][O.sub.75] OH:3[H.sub.2]O Talc [Mg.sub.3][Si.sub.4][O.sub.10] [(OH).sub.2] 2P in equ.
Generally, the equilibria of Mn[O.sub.2] (pyrolusite), [Mn.sub.2][O.sub.3] (bixbyite), [Mn.sub.3][O.sub.4] (hausmannite), MnC[O.sub.3] (rhodochrosite), and Mn[(OH).sub.2] (pyrochroite) with [Mn.sup.2+] are the dominant Mn systems in soil (Gotoh and Patrick 1972).
345 Calcite and pyrochroite, Franklin, New Jersey, no.